Method of making brake shoes



Aug. 29, 1933. an. EVANS 1,924,114

METHOD OF MAKING BRAKE SHOES Original Filed March 20, 19:51 2 Sheets-Sheet 1 m T l [mm B [UK/J26, 19

Aug. 29, 1933.

E. R; EVANS METHOD OF MAKING BRAKE snoas Original Filed-larch 20, 1931 2 Sheets-Sheet 2 Figure 4 is a .view of Figure Patented Aug. 29, 1933 v i I 1 924 114;

U E D f S AT PATENT OFFlCE V "1,924,114 f t METHOD: OF MAKING BRAKE snoEs Edwin R. Evans, )hicago, lll. I it Original application March 20, 1931, Serial 7N0.

524,01L- Divided'and this application March 18, 1932. Serial N0..599,625

"'4 Claims. (01. 29-4521) This invention relates to a new andimproved Figure 13 .is a view similar to Figure 12 but method of making a brake shoe, andmore parshowing the cam end of the shoe.

ticularly to a method of forming a brake shoe In Figure 1 the backing plate 11 is shown pro,- irom a continuous rolled section. I vided with bolts 12 by which it may besecured Brake shoes have heretofore beenmad'e in a to a steering knuckle (not shown). The backing 60. variety of ways, including castings and. light plate 11 carries a housing 13 which supports an metal stampings. In my prior application Serial adjustable brake shoe pivot pin 14. Thebearing No. 265,884, filed March 30, 1923, I have shown a ends 15 of the shoes 16 pass through slots in the shoe formed from a rolled' section, and in my housing 13 to engage in grooves in the pin 14. 7

10 application Serial No. 524,011, filed-March 20, The shoes 16 are .T- haped in cross section, being 1931, I have shown an improved rolled section provided with the cylindrical flange 1'7 and the shoe. The present application is a division of inwardlyextending web 18. The flange 17 carries the application last mentioned and relates to the brake lining 19 a p to engage the br the method of making the shoe covered in, that drum 20. The springs '21 are connected atone 15 application. k end to the shoes16 and at the other end to the It is an object to provide a method of making backing plate 11 so that they serve to retract the animproved brake shoeformed from a rolled secshoes from engagement with the brake drum 20. tion, of standard shape and provided with an The spr g y i p angular t us t the integral actuating portion. shoes tending to urge them toward the backing 20' It is an additional object to provide a method pla a d the webs of the Shoes y have a d of making a shoe of this character in which the P S ,4 for engaging t backing P actuating face is integrally connected to and fully The p r n 0 therefore qu ma h in o supported by a web of the rolled section. O y Small u sv It is a further object to provide a method oi The lower ends of the shoes, as Shown, are

making a shoe having an integral hardened actup v d W bent p ends 22 Which Serve as ating wear face. I actuating faces'to-engage the operating cam 23 Other and further objects will appear as the carried by brake Operating Sha t 'BOth the description proceeds, web 16 and flange 17 arebent or forged so that 30, I have shown certain preferred embodiments the f a throughout its eXtent, including the or my invention in the accompanying drawings, b up po on. i integrally a d p rmanen ly 3 in which- 7 connected. with the web.

Figure 1 is an elevation of my improved shoes 1110118 method of manufacture, as wn in applied to a brakeassembly, the brake drum be- Figures 10 t0 the Shoes a rmed from 3 ing t, away t h w th i teri r t straight'T-bars. These bars are first sawed to Figure 2 is a similar view of a single brake shoe give pi s f h p p length f th d sired I on an enlarged scale; shoes. Then the webs have outer portions adja- Figure 3 is a, view of Figure 2 a seen from cent the ends of the blanks cut away on lines as above; shown in Figures 10 and-11 so as to eliminate ex- 2 as Seen from cess metal. The ends of the blanks are then bent below; 7 up, the metal of the web being forged or swaged Figure 5 is a view of Figure 2 as seen from the to bring i t theform ow in t d aw n s. left; I There are no edgesto be joined by the forging Figure 6 is. a section of Figure 2 on line 6-6; SWaging a there is 110 W ng. The metal Figure 7 is Section of Figure 2 on 11116 q; v of the web is caused to flow to form the continu- Figure 8 is a section similar to Figure 6 showing 0115 web Showna modified formof construction; F ig z g Web f is of a depth sim ar 0 e ep 0 e wear ace 22 so that Y a giffi i g i lg i g to Flgure 8 showmg this face is supported by the web throughout its height. The flange portion of the blank which .50 Figure 10 is a perspective View partly broken forms the actuating face 22 is also deformed away, showlPg tnmfned blank? during the forming operation, being curved in Figure 11 IS a VleW 51 t0 Flgllle 10 showmg cross section as clearly shown'at 23 of Figure 4.

the blank after the W b has b trimmed; Also where the shoe is to be used in a structure Figure 12.is a perspective view of the pivot end in which the shoe is in a plane at an' angle to the no of the shoe after the forming operation; and plane of the swiveling axis, the curved portion of ingthe flange at permitequivalentrigidity with webs of less depth the bearing face may be formed on an angle as best shown in Figure 5. Due to this curved formation the edges of the flanges extend inwardly as shown at 24 and 25 of Figure 5.

The upper or pivot end 15 of the shoe may be formed by the same type of operations as the actuating end. The pivot end 15 has an end face 26 cut on an angle as shown in Figure 3 so asto fit in the angular grooves in the pivot pin 14 whereby axial movement of the pin will adjust the shoes.

A portion of the web 16 is shown bent over to give a bearing face 27 for a centralizer 28. This centralizer is shown in Figure 1 as a conical headed stud threaded into the backing plate 11.

The shoes may be suitablylheattreated as desired, after the forming operations are complete. The pivot ends15 and wear faces 23 maybe hardened to resist wear, by the cyanide process for example.

While the shoes have been described so far as being formed of T-shaped rolled section, it may be .founddesirable, in large sizes and with wide shoes to use sections having a plurality of inwardlyextending webs. Figure 8 shows a section havinga flange 30 and a pair of spaced webs 31 'and;32. Figure 9 shows achannelsection with a'base '33 and .legs 34 and 35. Sections such as these with a plurality of webs permit strengthena plurality of points and also than would be necessary with a lesser number of webs; The webs of less depth permit greater clearances in the assembly and also facilitatethe formingoperations of the ends of the shoes.

The forms of construction shown are to be takenas illustrative only, as the improved brake shoe is capable of variations and change to meet difiering requirements and I contemplate such changes and modifications as come within the spirit and scope of the appended claims.

length, said section having a flat face and a 'rearwardly extending reinforcing web, trimming excess metal from the end portions of the web, bending the section to arcuate form, and bending inwardly a portion of the flange and web to form1an approximately radial cam face, the excess metal removed from the web being such as to permit the remaining metal to flow under forming pressure to form'a continuous web integrally connected to the inwardly bent portion ofthe flange and a substantially uniform height and thickness.

3. The method of making a brakeshoe which comprises cutting a rolledsection to the required length, said section having a flat face and a rearwardly extending reinforcing web, trimming excess metal from .the end portions of the web, bending the section to arcuate form, bending inwardly a portion of the flange and web to form 5 an approximately radial cam face, and hardening the cam face.

4. The method of making abrake shoe which comprises cutting a .rolled section to the required length, said section having a fiat face and a rearwardly-extending reinforcing web, trimming excess metal from the end portions of the web, bending the section to arcuate form, bending inwardly a portion of theflange and web to form anapproximately radial cam face, and forming a '15 reducedpivot on the opposite end of the shoe.

' EDWIN R. EVANS. 

